2 We headed over to Off Road Evolution in Fullerton, California, to install our 6-inch Prerunner suspension. The staff there has plenty of experience building various rigs and had our truck back on the road in no time. We began by releasing the tension on the torsion bars so they could be removed, then removing the rest of the stock suspension, piece by piece. New arms, coilovers, and knuckles are given, so you’ll be using almost none of the stock equipment.